RESUMO
A rapid and simultaneous method by using inductively coupled plasma mass spectrometry (ICP-MS) was developed for determination of 19 elements in infant formula. Fast and efficient sample digestion was achieved by a microwave-assisted nitric acid procedure. An acetic acid was added to both these treated solutions and standard solutions as a countermeasure for carbon charge transfer in As, Se elements. The observed calibration curves showed good linearity (r(2)>0.9993) and the quantification limit was low. The recoveries of elements were 95.0-108% and the relative standard deviations (RSD) of this method were 0.3-4.2%. The analyzed values were in good agreement with the certified values in a NIST standard reference material. This study showed that the ICP-MS method is useful for major to trace multi-elemental determination in infant formula.
